CAJ | 학술논문

1000 kV 变压器由于电压等级高、容量大，其主接线方式和调压方式与500 kV 变压器存在显著差异，因此特高压变压器的保护配置与传统变压器保护配置存在不同。在分析特高压变压器一次结构的基础上，提出了适合特高压变压器的保护配置方案。为了解决主变压器空投时调压变压器差动电流中二次谐波含量低可能造成差动保护误动的问题，对调压变压器和补偿变压器差动保护的励磁涌流识别方案进行了改进。通过动模试验和现场运行检验，证明了特高压变压器保护配置和励磁涌流改进方案的正确性和有效性。
1000 kV 변압기유우전압등급고、용량대，기주접선방식화조압방식여500 kV 변압기존재현저차이，인차특고압변압기적보호배치여전통변압기보호배치존재불동。재분석특고압변압기일차결구적기출상，제출료괄합특고압변압기적보호배치방안。위료해결주변압기공투시조압변압기차동전류중이차해파함량저가능조성차동보호오동적문제，대조압변압기화보상변압기차동보호적려자용류식별방안진행료개진。통과동모시험화현장운행검험，증명료특고압변압기보호배치화려자용류개진방안적정학성화유효성。
With a high voltage level and large capacity,the main wiring and voltage regulation mode of the 1 000 kV transformer are markedly different from those of a 500 kV transformer.Thus the protection configured for an ultra high voltage (UHV) transformer differs from traditional transformer protection.Based on an analysis of the UHV transformer primary structure,this paper presents a protection scheme suitable for the UHV transformer.In order to solve the problem of differential protection malfunction presumably due to the low secondary harmonic content in the regulating transformer”s differential current during the main transformer no-load closing process,the inrush current identification scheme is optimized for the compensation transformer and the regulating transformer.The correctness and validity of the UHV transformer protection configuration and the improved solution for inrush current are proved by dynamic simulation and field operation.